Heating device for shoe sticking presses



May 23, 1933. Q. M|HALK 1,910,474

HEATING DEVICE FOR SHOE STICKING PRESSES Filed May 19, 1931 q 12 i I a 2 L I %&

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OTTO M ICHHLIC Patented May 23, 1933 UNETED STATES OTTO MICHALK, OF FREITAL-DRESDEN, GERMANY HEATING nnvrcn non snon srroxrne rnnssns Application filed May 19, 1931, Serial No. 538,566, and in Germany June 6, 1930.

It is already known to provide the press cushions of shoe sticking presses with a heating device for accelerating the drying of the adhesive. Thus it has been proposed to arrange a tube in the hollow interior of the press cushion, through which a heat carrier, for instance water or steam, is caused to flow. According to another mode of construction an electric heating device is provided under the block carrying the press cushion.

Another proposal consists in arranging a readily flexible electric heating grid between the press bag and the shoe sole to be stuck on. All these proposals have the same idea in common, namely to replace the quantity of heat which is lost by conduction and radiation, even during the sticking operation, by a continued supply of heat. This method has been found to be detrimental, particularly in the case of those shoe sticking machines in which the individual sticking presses are fitted on a revolving rotary member. It is not possible here to supervise continuously the quantity of heat supplied to the individual press and the work piece because this is very largely dependent on the room temperature and the ventilation conditions. The electric heating in particular has in addition the drawback that, owing to the continuous bending of the heating cushion the heating wires either break or a short circuit takes place. In the first case the temperature of the point of the press in question drops in an undesired manner and in the second case too high a temperature may be produced by the short circuit, by means of which the leather and in some cases also the press bag is damaged. Experiments have now disclosed that all these drawbacks are avoided if a heat carrier heated outside the shoe sticking press is inserted between the shoe sole and the press cushion each time an individual press is charged with a work piece. There is no difficulty in maintaining a considerable number of such heat carriers at the desired temperature in order to enable the reserve to be drawn from according to requirements. For the present purpose a heat carrier of asbestos is the most suitable, since on the one hand it is non-combustible and on the other hand it is sufliciently flexible.

The invention is illustrated in the accompanying drawing wherein the single figure is a side elevation of a shoe sticking press showing the improved heating element.

In the drawing, 10 designates the mold or base of a shoe sticking press, 12 the press cushion disposed thereon, 14 the last, 16 the press head pivoted at one end as at 18 to an adjustable support 20 carried by the mold or base 10, 22 projections on the press head for engagement with the last 14, and 24 a bail pivoted to the mold or base 10 and engageable with the free end of the press head to hold the projections 22 thereof engaged with the last thus to hold the last and the shoe, designated as S, in operative relationship to the press cushion.

At 26 is designated the improved heating element which, as illustrated, is an element separate from the mold 10 and the press cushion 12 and is interposed between the latter and the shoe sole so as to maintain the latter at the desired degree of temperature during sticking of the same to the shoe upper structure. The heating element is, as aforesaid, preferably formed from asbestos, although it may be formed from any other material which is flexible to accommodate itself to the irregular shape of the shoe and which has good heat retention properties.

A number of the elements 26 are provided and these, heated in any desired manner to the desired temperature, are arranged between the press cushion and the shoe sole as required.

What Ioclaim is 1. Means for use in a shoe sticking press to maintain a shoe soleat a desired temperature during sticking of the same to a shoe upper structure, comprising a flexible element entirely separate from the press to be heated at a point removed from the press and to be disposed at the desired time between the shoe sole and the press cushion of the press, said element being formed from non-combustible material having good heat retention properties.

2. Means for use in a shoe sticking press to maintain a shoe sole at a desired temperature duringsticking of the same to a shoe upper structure, comprising a flexible element entirely separate from the press to be heated at a point removed from the press and to be disposed at the desired time between the shoe sole and the press cushion of the press, said element being formed from asbestos.

In testimony whereof I have aflixed my signature.

OTTO ;M-ICHALK; 

